diff --git a/gst-libs/gst/rtp/gstrtpbuffer.c b/gst-libs/gst/rtp/gstrtpbuffer.c
index d4c2edfe82..16e740c25d 100644
--- a/gst-libs/gst/rtp/gstrtpbuffer.c
+++ b/gst-libs/gst/rtp/gstrtpbuffer.c
@@ -1494,7 +1494,7 @@ get_onebyte_header_end_offset (guint8 * pdata, guint wordlen)
 
 gboolean
 gst_rtp_buffer_add_extension_onebyte_header (GstRTPBuffer * rtp, guint8 id,
-    gpointer data, guint size)
+    gconstpointer data, guint size)
 {
   guint16 bits;
   guint8 *pdata = 0;
@@ -1593,7 +1593,7 @@ get_twobytes_header_end_offset (const guint8 * pdata, guint wordlen)
 
 gboolean
 gst_rtp_buffer_add_extension_twobytes_header (GstRTPBuffer * rtp,
-    guint8 appbits, guint8 id, gpointer data, guint size)
+    guint8 appbits, guint8 id, gconstpointer data, guint size)
 {
   guint16 bits;
   guint8 *pdata = 0;
diff --git a/gst-libs/gst/rtp/gstrtpbuffer.h b/gst-libs/gst/rtp/gstrtpbuffer.h
index f544f83df9..46a6e9cd7d 100644
--- a/gst-libs/gst/rtp/gstrtpbuffer.h
+++ b/gst-libs/gst/rtp/gstrtpbuffer.h
@@ -142,12 +142,12 @@ gboolean        gst_rtp_buffer_get_extension_twobytes_header (GstRTPBuffer *rtp,
 
 gboolean       gst_rtp_buffer_add_extension_onebyte_header  (GstRTPBuffer *rtp,
                                                              guint8 id,
-                                                             gpointer data,
+                                                             gconstpointer data,
                                                              guint size);
 gboolean       gst_rtp_buffer_add_extension_twobytes_header (GstRTPBuffer *rtp,
                                                              guint8 appbits,
                                                              guint8 id,
-                                                             gpointer data,
+                                                             gconstpointer data,
                                                              guint size);
 
 /**